Journal
JOURNAL OF ENVIRONMENTAL ENGINEERING
Volume 138, Issue 1, Pages 119-128Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)EE.1943-7870.0000455
Keywords
Rice husk silica; Fe-RH-MCM-41; As(III); As(V); Adsorption; Kinetic model
Funding
- National Research Foundation, Republic of Korea [2010-0009491]
- National Research Foundation of Korea [2010-0009491] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The adsorption efficiency for both arsenite [As(III)] and arsenate [As(V)] by iron [Fe(III)], doped and loaded onto and into RH-MCM-41, was tested in a batch reactor. Fe-RH-MCM-41 at the Si/Fe mole ratio of 10, prepared by the direct hydrothermal technique (DHT), gave the higher adsorption values with both arsenic species, compared with Fe/RH-MCM-41 prepared by the wetness impregnation technique (WIT). The equilibrium times for As(III) and As(V) were 16 and 4 h, respectively. The adsorption values for Fe-RH-MCM-41 (DHT-10) were affected by initial arsenic concentration and by initial solution pH. For As(V), adsorption was highest at pH 3; for As(III), it was highest at pH 9 (but the factor did not prove significant). The adsorption isotherm fit well with the Langmuir model for both arsenic species. The pseudo-second-order kinetic model could explain As(III) and As(V) adsorption results. The adsorbent system tested here could be upscaled to a packed bed column to treat water for arsenic, especially in remote communities. DOI: 10.1061/(ASCE)EE.1943-7870.0000455. (C) 2012 American Society of Civil Engineers.
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